That always bothered me. Future trunks was a badass in my opinion yet he didn't become a super saiyan till Gohan died (which makes sense considering it took Goku the loss of Kirllin). Kid trunks however turned super saiyan at the age of . . . what, 8? . . . and grew up to be horribly insignificant with gt. But then again, I have a lot of issues with gt.

I don't know if this is true, but I believe it is easier for them to become Super Saiyan if their father already had become one. It took Gohan a while to achieve it because he was born before Goku ascended, but since Goten was born after Goku achieved it Goten could thus achieve it much easier. The same works out for both Future Trunks and kid trunks. I don't know though, this is just a theory.

I've thought of this too, but I also thought; what if the super saiyan form was supposed to be the next step in the evolution of the saiyans. For some reason the original super saiyan was unable to pass on his genes to the next generation and so it died out with him. Then Goku and Vegeta come along and are able to bring it back. They pass it on to the next generation and from this point all saiyans will be super saiyans. Anyway I'm kinda tired so I hope that makes sense.

That's because everyone was stronger after Cell came. And hybrids seem to have potential to be stronger than Saiyans, but they have less motivation to train. So after years of peace, they get weaker while full-blooded saiyans keep training. That's why Goku and Vegeta became the only relevant characters years later in GT while the children always seemed to be the only hope in DBZ.

I cant argue with that, but It still would have been nicer to see someone other than goku solo-ing everything again. Cell vs gohan and majin vegeta were all bad ass, future trunks vs frieza was bad ass, having Goku be only real hero (with some help from vegeta) in gt got old really quickly

While this is mostly true, I really loved Gohan during the cell saga and Majin Vegeta and really wished Mystic Gohan didnt become such a disappointment. And i have too many issues with GT to go over, Trunks is among the least of them.